JPH11211202A - Remote control light emitting device - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a remote control light emitting device capable of projecting infrared light only to a target device with high efficiency and ensuring a sufficient life even with a small battery. SOLUTION: A light-emitting element 3 provided in a remote control housing 1 and a light-guiding material 6 for guiding light from the light-emitting element 3 to the outside are provided, and the light-guiding material 6 is formed in a Fresnel lens shape. Things. Further, a reflection polyhedron 8 for reflecting and guiding infrared light is provided on the back surface of the light emitting element 3 or the light guide 6 is fixed to a remote control housing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared remote control light emitting device, for example, a remote control light emitting device used for remote control of an air conditioner.

[0002]

2. Description of the Related Art A conventional remote control light emitting device will be described below with reference to the drawings. FIG. 4 is a sectional view of a main part showing an example of a conventional remote control light emitting device. In the figure, 1 is a remote control housing, 2 is a light guide material, 3 is a light emitting element, 4 is a light emitting element 3
The printed circuit board on which is mounted the light emitting element 3
Is infrared light emitted from the light source and projected. The infrared light 5 projected from the remote control light emitting device configured as described above is diffused widely, and only a small part of the light is received by the light receiving element of the controlled device. The reach is shorter. Therefore, when the controlled device is located in a remote place such as an air conditioner, sufficient electric energy is applied to the light emitting element on the remote control light emitting device side to compensate for the decrease in the received light energy. I needed to.

[0003]

However, in such a configuration, it is necessary to use a light emitting element corresponding to a high output or to send a large electric energy to the light emitting element. If the same device is installed in a large room, etc., outside the life span, all devices will receive infrared light from the remote control, making it difficult to receive only the target device. And so on.

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to project infrared light only to a target device with high efficiency, and to secure a sufficient life even with a small battery. It is intended to provide a device.

[0005]

According to the present invention, there is provided a remote control light emitting device, comprising: a light emitting element provided in a remote control housing; and a light guide for guiding light from the light emitting element to the outside. Is formed in a Fresnel lens shape.

According to the present invention, it is possible to project infrared light only to a target device with high efficiency, and a sufficient life can be ensured even with a small battery.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for the same parts as those of the conventional one.

FIG. 1 is a cross-sectional view of a main part of a remote control light emitting device according to an embodiment of the present invention, FIG. 2 is a front view of the remote control light emitting device shown in FIG. 1, and FIG. FIG. In each figure, 1 is a remote control housing, 3 is a light emitting element, 4 is a printed circuit board of a remote control circuit on which the light emitting element 3 and the like are mounted, 5 is infrared light emitted from the light emitting element 3 and projected, Numeral 6 is a light guide material, which is formed of an infrared transmitting material having a visible light blocking property in the form of a Fresnel lens, and its periphery 6a is fixed to the infrared light transmitting window 1a of the remote control housing 1, and further extended ends thereof. The portion 6b is viewed through a window 1b provided on the upper surface of the remote control casing 1, and is displaced downward by pushing the portion in the direction of arrow A. 7 is an end 6 of the light guide 6
The switch is pushed by a push pin 6c provided on the back surface of the printed circuit board b, and is attached to the printed circuit board 4 to simplify its mechanical and electrical connection. Reference numeral 8 denotes a polyhedral reflector provided on the back surface of the light emitting element 3.

By forming the light guide member 6 in a Fresnel lens shape in this manner, the emission angle of the infrared light 5 can be reduced regardless of the positional relationship between the light emitting element 3 and the infrared light transmitting window 1a of the remote control housing 1. In addition to being able to freely set the tilt angle of the Fresnel lens, it is possible to give the directivity to the infrared light and concentrate the infrared light in the target direction, and the effective reach of the emitted infrared light is long Become. Since the Fresnel lens is made of a material having a visible light blocking characteristic, there is no need to use a separate visible light blocking filter. Further, since the Fresnel lens is thinner than other lens types, transmission loss is reduced. Further, by providing the polyhedral reflector 8, a device that efficiently reflects infrared light toward the target by reflecting and guiding the light energy diffused to the side of the light emitting element or in the target direction. Therefore, the life of the battery can be extended, the size can be reduced, the degree of freedom in designing the surrounding structure can be increased, and the size of the remote control unit can be reduced. Furthermore, by using the end portion 6b extended from the light guide member 6 as a pusher, the switch 7 on the printed circuit board 4 can be pushed as described above despite the inexpensive configuration, and various other applications can be made. Becomes possible.

[0010]

As described above, according to the present invention, by forming the light guide material into a Fresnel lens shape, regardless of the positional relationship between the light emitting element and the infrared light transmitting window of the remote control housing.
Since the emission angle of the infrared light can be freely set by the inclination angle of the Fresnel lens, it is possible to give the directivity to the infrared light and to concentrate the infrared light in a target direction, resulting in high efficiency. The effective range of the emitted infrared light becomes longer, and the Fresnel lens has an advantageous effect of reducing the transmission loss of the infrared light because it is thinner than other lens types.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a configuration of an embodiment of a remote control light emitting device of the present invention.

FIG. 2 is a front view of the remote control light emitting device shown in FIG. 1;

FIG. 3 is a top view of the remote control light emitting device shown in FIG. 1;

FIG. 4 is a sectional view of a main part showing an example of a conventional remote control light emitting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Remote control housing 2 Light guide material 3 Light emitting element 4 Printed circuit board 5 Infrared light 6 Light guide material 7 Switch 8 Polyhedral reflector

Claims (3)

[Claims] 1. A light-emitting element provided in a remote control housing, and a light-guiding member for guiding light from the light-emitting element to the outside, wherein the light-guiding member is formed in a Fresnel lens shape. Remote control light emitting device. 2. The remote control light emitting device according to claim 1, wherein the light emitting element has a polyhedral reflector for reflecting and guiding infrared light on a back surface thereof. 3. The light guide member according to claim 1, wherein the periphery of the light guide member is fixed to a remote control housing, and the other portion is configured to be displaceable with respect to the remote control housing. Or the remote control light emitting device according to claim 2.